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1993. Dorion Sagan and Lynn Margulis. "Microbes do far more than merely occupy space or cause disease. All of the elements crucial to global life (oxygen, nitrogen, phosphorus, sulfur, carbon) return to a usable form through the intervention of microbes." This book is an exciting road to knowledge in understanding modern technologies such as the transfer of DNA and RNA used in medicine, agriculture, industrial microbiology, and waste removal. 240 pages, hard cover, intricate b&w illustrations.